Watchgoose - Cron job and backup monitoring
Watchgoose monitors cron jobs, backups, and other recurring tasks with heartbeat pings. Add a check, configure when a run is due and its grace period, then have your script send a ping after it completes. If an expected ping does not arrive within the configured window, Watchgoose alerts you so a missed run does not stay unnoticed. Tasks can also report explicit failures. It works with anything that can make an HTTP request, without requiring an agent on the job host. The service is Europe hosted, operated and owned, with a free plan available without a credit card.